Answer :
11. C) Carbon dioxide is released during photosynthesis and used during cellular respiration. During photosynthesis Carbondioxide is fixed to carbohydrate and oxygen is released. and hence there is no evolution of carbon dioxide. In cellular respiration no carbodioxide is used instead it is released.
13. A) ATP. It is used in various steps during glycolysis
13. A) ATP. It is used in various steps during glycolysis